diff --git a/sagemath.spec b/sagemath.spec
index 1633869..5c2772a 100644
--- a/sagemath.spec
+++ b/sagemath.spec
@@ -299,6 +299,7 @@ Requires:	python-ipython
 Requires:	python-matplotlib
 Requires:	python-networkx
 Requires:	python-polybori
+Requires:	python-twisted-mail
 Requires:	python-twisted-web
 Requires:	python-twisted-web2
 Requires:	python-ZODB3